Page 42 - ConveyorBeltMaintenanceManual2010

QUICK-CHECK method for approximate maximum tension (Tm) used only on
existing conveyors which require power when loaded.
NOTE: Do not use for
decline belts.
Many small conveyors require more
carcass for load support and impact
than is required for maximum tension.
For that reason, the belt selection is
based primarily on load support,
pulley diameter, impact and cost.
However, during the investigation of
such belts, it is advisable to check the
possibility that maximum tension may
be a factor.
In such cases, QUICK-CHECK offers
a quick, simple method of
approximating themaximum tension.
If the result is low enough to show
that tension is not a factor, then no
further calculations are required.
However, if the result indicates tension
may be a factor, then more data
should be gathered and maximum
tension calculated using the
appropriate formulas.
The appropriate maximum tension
will normally be higher than that
obtained through the regular formulas.
To determine the approximate
maximum tension using QUICK-
CHECK:
IMPERIAL
1. Find the proper belt speed, type
of take-up, and type of pulley;
the corresponding number is the
approximate maximum tension
per motor horsepower.
2. Multiply this number (Tm,
approximate maximum tension
per motor horsepower) by motor
horsepower to obtain approximate
maximum tension in pounds.
3. Divide the approximate maximum
tension in pounds by the belt
width to obtain the approximate
required PIW.
4. If the approximate PIW is equal to
or greater than the tension rating
of the load support belt, then a
more accurate maximum tension
should be calculated. Contact
your local Goodyear EP distributor
for assistance.
METRIC
1. Find the proper belt speed, type
of take-up, and type of pulley;
the corresponding number is the
approximate maximum tension
per motor kilowatt.
2. Multiply this number (Tm,
approximate maximum tension
per motor kilowatt) by motor
kilowatts to obtain approximate
maximum tension in newtons.
3. Divide the approximate maximum
tension in newtons by the belt
width to obtain the approximate
required N/mm or kN/m.
4. If the approximate Tm is equal to
or greater than the tension rating
of the load support belt, than a
more accurate maximum tension
should be calculated. Contact
your local Goodyear EP distributor
for assistance.
40
INSTALLATION, MAINTENANCE & TROUBLESHOOTING GUIDE
Q U I C K C H E C K
METRIC VALUES
QUICK-CHECK METHOD FOR MAXIMUM TENSIONS –
SINGLE PULLEY DRIVES
APROX. “Tm”—Newtons per motor Kw
(Power Requiring Conveyors only)
(10% Drive Losses)
Counterweight
Take-Up Screw Take-Up
Lagged Bare Lagged Bare
Pulley Pulley Pulley Pulley
0.25 4968 5400 5976 6480
0.50 2484 2700 2988 3240
0.75 1656 1800 1992 2160
1.00 1242 1350 1494 1620
1.25 994 1080 1195 1296
1.50 828 900 996 1080
1.75 710 771 854 926
2.00 641 675 747 810
2.25 552 600 664 720
2.50 497 540 598 648
2.75 452 491 543 589
3.00 414 450 498 540
3.25 382 415 460 498
3.50 355 386 427 463
3.75 331 360 398 432
4.00 310 337 374 405
4.25 292 318 352 381
4.50 276 300 332 360
Belt Speed
“S”
Meters/Sec.
IMPERIAL VALUES
QUICK-CHECK METHOD FOR MAXIMUM TENSION –
SINGLE PULLEY DRIVES
APPROX. “Tm”—lbs. per Motor HP
(Power Requiring Conveyors only)
(10% Drive Losses)
Counterweight
Take-Up Screw Take-Up
Lagged Bare Lagged Bare
Pulley Pulley Pulley Pulley
50 820 892 986 1070
100 410 446 493 535
150 273 297 329 356
200 206 224 248 268
250 164 179 198 224
300 136 148 164 178
350 117 127 141 153
400 102 111 123 133
450 91 99 110 119
500 83 90 100 108
550 75 81 90 97
600 69 75 83 90
650 64 69 77 83
700 59 65 72 77
750 55 60 67 72
Belt Speed
“S”
Ft./Min.